Free Online Emergency Fund Calculator

What this emergency fund calculator shows

This emergency fund calculator tells you how much money your safety net should hold and how much of it you already have. You enter what you spend in a month, what you have saved and how many months you want to be covered. The calculator multiplies the first by the third, compares the result with your savings and shows the gap in money, in months and as a percentage.

An emergency fund is cash set aside for the things nobody schedules: losing a job, a car that will not start, a medical bill, a broken boiler. Its job is to let you pay for them without a credit card balance, a loan or selling investments at a bad moment. In the Federal Reserve's 2025 survey of US households, 59 percent of adults had at least one major unexpected expense in the previous twelve months, and only 55 percent said they had three months of expenses set aside.

The calculator is useful when you set a first savings goal, decide whether three or six months is enough, or check whether a balance you already have is too small or more than you need. It is a planning aid, not advice. Everything runs in your browser, and nothing you enter is sent anywhere.

In this guide:

• How to fill in each field and read the target fund, the three figures and the chart
• The simple formulas behind the numbers and what they leave out
• How many months to save, which expenses to count and whether $10,000, $20,000 or $50,000 is enough
• How US households compare, where to keep the money and how long it takes to build
• Three worked examples, a reference grid and common mistakes

For the ideas behind it, read the basics article on what an emergency fund is and how to build one.

How to use the emergency fund calculator

The calculator opens in US dollars with Monthly expenses of $4,000, Current savings of $6,000 and a target of 6 mo. With those defaults the headline shows a target fund of $24,000, with Current coverage of 1.5 mo., $18,000 Still needed and a Fund completion of 25%. The examples in this guide keep USD, and one switches to EUR. The UAH / USD / EUR switch sits in the header of the Your numbers panel, or under More options on phones and tablets. Only the symbol and formatting change; nothing is converted. The fields appear in this order:

1. Monthly expenses. What you spend in a typical month on the essentials you would keep paying without an income.
2. Current savings. The money you already hold for emergencies. Leave out investments and money set aside for planned purchases.
3. Target coverage (months). A row of four options below the two amounts: 3 mo., 6 mo., 9 mo. and 12 mo. The selected option is the target in use.

Each amount has a number box and a slider. The sliders run from 0 to 10,000 in steps of 100 for Monthly expenses and from 0 to 50,000 in steps of 500 for Current savings, or 0 to 200,000 and 0 to 1,000,000 in hryvnia. Larger amounts can be typed; a value below 0 or above 100,000,000 is pulled back to that limit when you leave the box. On phones, the two amounts have − and + buttons instead of sliders, stepping by 100 and 500 in USD or EUR and by 2,000 and 10,000 in hryvnia.

Reading the results

The headline, Your target fund (6 mo.), is the size of the fund you are aiming for: monthly expenses times the target months. Its label follows the target you choose. A bar under it splits the target into what you have Saved (light navy) and what is Still needed (grey), with a legend below. Three figures follow:

• Current coverage is how many months your savings would last at your monthly expenses, shown with one decimal.
• Still needed is the target fund minus your savings, marked with the grey of its bar segment.
• Fund completion is your savings as a share of the target fund, shown with up to one decimal and capped at 100%.

When your savings reach the target fund, a Goal reached! notice appears in the results. Beyond it, the bar shows Saved, filled up to the target, and Surplus (navy), the part of your savings beyond it, and a Surplus figure takes the place of Still needed. Below the results, a chart without a title draws the same split as one horizontal bar on a money axis; hover over or tap it to see the amounts. There is no year-by-year table, because nothing in this model changes over time.

Pin to compare keeps the current inputs as a reference, and it compares the target fund only. The headline shows a grey change, such as +$9,000 vs pinned in Example 1, the chart adds a dashed vertical marker with a white edge at the pinned target, widening its axis if needed, and a caption sums it up, such as "Pinned scenario: 3 mo. × $3,000 → $9,000". Because the pin compares targets, not progress, changing only Current savings leaves the headline at ±$0 vs pinned; the change shows in the figures and in where the bar ends against the marker. Switching the currency, Reset or a reload clears the pin. PDF exports your inputs and four results, Required amount, Current coverage, Still needed and Fund completion, without the pin. Share shares a link without your numbers, and Reset restores the defaults, including US dollars. On phones and tablets, the results sit in a bar at the bottom of the screen with the headline and a small version of the bar; Details opens the legend, the figures, the notice, the chart and the buttons.

How the emergency fund calculation works

There is no growth, no interest and no time in this model. The calculator takes your three inputs as they are today and does four pieces of arithmetic.

The four formulas

Target fund       = E × T
Current coverage  = S ÷ E
Still needed      = max(0, E × T − S)
Fund completion   = min(100%, S ÷ (E × T) × 100%)

• E is Monthly expenses, in the currency you selected
• S is Current savings, in the same currency
• T is Target coverage (months): 3, 6, 9 or 12
• max(0, …) means the gap never goes below zero, and min(100%, …) means completion never goes above 100%

Surplus, which replaces Still needed once you pass the target, is its mirror image: S − E × T when that is positive, and nothing otherwise. Goal reached! appears when S is equal to or greater than E × T.

Coverage and completion tell the same story

Current coverage and Fund completion are two views of one ratio. Coverage counts in months, completion in percent of your target:

Fund completion = Current coverage ÷ T × 100%

With $7,200 saved and $3,000 of monthly expenses, coverage is 2.4 mo. Against a 3 mo. target, that is 80% complete; against 6 mo., it is 40%. Changing the target moves completion and Still needed, but never coverage, because coverage does not depend on the target at all.

Rounding on screen

Money is shown in whole units. Current coverage is rounded to one decimal and Fund completion to at most one decimal, while Still needed is exact. Near the goal, the rounded figures can look finished before you are: with $17,995 saved against an $18,000 target, Current coverage reads 6.0 mo. and Fund completion 100%, but Still needed shows $5 and Goal reached! does not appear. Trust Still needed and the Goal reached! notice.

Assumptions behind the numbers

• Expenses stay constant. Every month costs the same as the figure you enter. Real spending varies, and some costs, such as health insurance after a job loss, can rise in an emergency.
• No income during the emergency. Coverage assumes nothing comes in. Unemployment benefits, a partner's income or severance pay would make the money last longer.
• No interest and no inflation. Savings neither earn interest nor lose purchasing power while you wait.
• No timeline. The calculator shows the gap, not how long it will take to close it. A section below works that out for a few monthly savings amounts.
• One currency. Expenses and savings are in the currency you pick. Nothing is converted between currencies.
• Expenses above zero. The formulas divide by Monthly expenses, so the results only make sense when that figure is above zero. At zero, Current coverage shows a dash instead of a number of months.

How many months of expenses should be in an emergency fund

Most guidelines give a range of three to six months of essential expenses, and more for people whose income is less secure. There is no single right number. The question to ask is how long it could take you to replace a lost income, and how many large surprises your household might face at once.

The calculator's four targets map to common situations:

Factors that point to a longer target:

• Income stability. Freelancers and business owners face months with little or no income even without a crisis.
• Dependants. Children or relatives you support raise the essential budget and the cost of a shortfall.
• One income. If you are the only earner, there is no second salary to fall back on.
• Job market. A specialised role can take many months to replace.
• Insurance gaps. High deductibles, no disability insurance or an old car with no warranty all add risk.

The 3-6-9 rule

You may see this described as the 3-6-9 rule. It is an informal rule of thumb, not an official standard, and it is used in two ways. One reading matches the table above: three months for very secure incomes, six for typical ones, nine for irregular ones. The other treats the numbers as stages: reach three months, then six, then nine. Either way the calculator handles it: click 3 mo., 6 mo. or 9 mo. and the target fund in the headline updates while your Current coverage stays the same.

Which expenses to count

The Monthly expenses field drives every result, so what you put in it matters more than any other choice. The usual advice, as in the basics article, is to count essential expenses: the bills you would still have to pay with no income. That keeps the target reachable and reflects what you would actually do in a crisis, which is cut everything else.

Here is an illustrative budget for a single renter. The amounts are an example, not statistics:

The essential lines add up to $3,000 and the full budget to $3,800. Entered as Monthly expenses with a 6 mo. target, the essentials give a target fund of $18,000 and the full budget $22,800. Pin the essentials, enter 3800, and the headline shows +$4,800 vs pinned. For 3 mo., it is $9,000 against $11,400.

Some points to get right:

• Use an average. Bills such as heating, car insurance or annual subscriptions arrive unevenly. Add up the last three to twelve months and divide by the number of months.
• Include irregular essentials. A yearly insurance premium or property tax bill divided by twelve belongs in the figure.
• Think about what changes in a crisis. If you lose a job that provides health insurance, the replacement cover may cost more. Commuting costs may fall.
• Be honest about cuts. If you know you would not cancel something, such as childcare, count it.

Inflation slowly raises all of these figures. A target set three years ago may now buy fewer months, so recalculate when your bills change. The article on inflation and why money loses value explains the effect.

Is $10,000, $20,000 or $50,000 enough

Search for emergency funds and you will find questions about round amounts. The honest answer is that a dollar amount means nothing until you divide it by your expenses. That is what the Current coverage figure does. Here it is for five levels of monthly expenses and four balances:

Read it with the target table in mind:

• $10,000 is a five-month fund at $2,000 a month and covers 3.3 months at $3,000. At $5,000 a month it lasts 2.0 months.
• $20,000 is more than a six-month fund at $3,000 a month and covers 4.0 months at $5,000.
• $50,000 covers 8.3 months at $6,000 a month, which is reasonable for a single earner with a family. At $2,000 a month it covers 25.0 months, far beyond any usual target.

A fund that is larger than you need is not a mistake, but it has a cost. Cash earns little interest, and money that sits in it for years misses the growth that long-term investments may offer, along with their risks. The article on risk and return explains that trade-off. When your savings exceed the target, the calculator shows the excess as Surplus in the figures, the bar and the chart.

How US households' emergency savings compare

The Federal Reserve's Economic Well-Being of U.S. Households in 2025 report (May 13, 2026), based on a survey of nearly 13,000 adults in October 2025, measures how many people have a cushion:

• 63 percent of adults would cover a hypothetical $400 emergency expense completely with cash or its equivalent, unchanged from the previous three years and down from 68 percent in 2021.
• 12 percent said they would be unable to pay a $400 expense by any means.
• 55 percent had set aside three months of expenses in an emergency or rainy day fund, unchanged from 2024 and down from 59 percent in 2021. 30 percent could not cover three months of expenses even by borrowing, selling assets or using other savings.

The share with three months set aside rises with income and age:

The survey also shows what emergencies look like. 59 percent of adults had at least one major unexpected expense in the prior twelve months; the most common were a major vehicle repair or replacement (30 percent), a major house or appliance repair (22 percent) and unexpected major medical expenses (21 percent). For those three, the median cost was $1,000 to $1,999. A cushion of a few thousand dollars covers the median cost of each of these; the three to twelve months in the calculator are sized for losing an income.

Spending less than you earn is what builds the fund: among adults who always had money left over at the end of the month, 86 percent had three months of savings, against 13 percent of those who never did. These figures will change when the Federal Reserve publishes its next report, expected in 2027.

Where to keep an emergency fund

An emergency fund has two jobs that rule out most investments: the money must be there when you need it, and it must not be worth less on that day. That points to insured bank and credit union accounts.

In the US, the FDIC's Understanding Deposit Insurance page explains that deposit insurance covers $250,000 per depositor, per FDIC-insured bank, for each account ownership category. It covers checking, savings and money market deposit accounts and certificates of deposit. It does not cover stocks, bonds, mutual funds, annuities, crypto assets or U.S. Treasury bills, bonds and notes. The NCUA provides the same $250,000 of federal share insurance at federally insured credit unions. Most emergency funds are well below that limit; if yours is not, splitting it between banks or ownership categories keeps it fully insured.

What does the money earn? The FDIC's National Rates and Rate Caps for September 2026 (as of September 21, 2026) show the national averages, weighted by each institution's share of deposits. The interest column is a simple calculation for this guide:

Because the averages are weighted by deposits, they mostly reflect the largest institutions. Rates differ between banks and credit unions, so compare what yours pays with these figures, which the FDIC updates every month.

A common structure is to keep one or two months in a savings or checking account for instant access, and the rest in a high-yield savings account, a money market deposit account or a ladder of short CDs. Money market funds and Treasury bills can also be easy to sell, but they are investments, not insured deposits; the types of investment assets article explains the difference. Avoid putting the fund in stocks or long-term bonds, and avoid keeping large amounts of cash at home.

The calculator does not add interest, so it slightly understates how fast an interest-bearing fund grows. To see what a deposit earns over time, use the deposit vs investment calculator.

How long it takes to build your fund

The calculator shows how much is Still needed but not how long it will take. Dividing the gap by what you can save each month gives the answer. The table below is a calculation for this guide, rounded up to whole months and without interest:

Even $250 a month builds a three-month fund for a $3,000 budget, $9,000, in three years. A six-month fund at the same rate takes six. That is why staged goals help: one month first, then three, then six. Each stage is a smaller number in the Still needed figure, and the calculator makes the progress visible as Fund completion rises.

Ways to speed it up:

• Automate it. A standing transfer to a separate account on payday does more than good intentions.
• Use windfalls. Tax refunds, bonuses and cash gifts can close a large part of the gap at once.
• Decide the order with debt. A small cushion before paying off high-interest debt keeps the next surprise off the credit card. After that, high-interest debt usually comes before the rest of the fund. The loan and mortgage calculator shows what a debt costs while you decide.

To plan a savings target with a deadline and a return, use the investment goal calculator. For an emergency fund, though, the return should not be the point: safety and access come first.

Emergency fund at a glance

This grid shows the target fund for common levels of monthly expenses and each of the calculator's four targets. It is the same arithmetic the calculator runs: monthly expenses times months.

Read down a column to see how much spending changes the target, and across a row to see what each extra three months costs. Each step of three months adds three times your monthly expenses, and cutting $500 from essential spending lowers a six-month target by $3,000.

Worked examples

Each example shows what the calculator returns. The first and third use USD, the second EUR.

Common mistakes when sizing an emergency fund

• Using your full budget without deciding to. In the example budget above, counting restaurants, travel and shopping raises the target by more than a quarter. That is fine as a choice, but most guidelines mean essential expenses.
• Using one good month. A month without the car insurance bill understates what you spend. Average several months, including irregular essentials.
• Counting investments as savings. Stocks and funds can fall when a recession also costs you your job. Enter only cash you could spend within a day or two as Current savings.
• Reading 100% as finished. Fund completion and Current coverage are rounded. Check that Goal reached! appears and that Surplus has replaced Still needed.
• Forgetting the currency. The calculator opens in US dollars. If you budget in euros or hryvnias, switch the currency first; nothing is converted, so enter amounts in the currency you choose.
• Setting the target once and never again. A new child, a move or higher rent changes the target fund. Rerun the numbers once a year.
• Leaving the fund in a zero-interest account. At the 0.07% national average for interest checking, $18,000 earns about $13 a year. On the FDIC's national averages, savings and money market accounts pay more.
• Not refilling it. An emergency fund that has been used is a new gap. Restart the monthly transfer as soon as the emergency is over.

Limitations and next steps

The emergency fund calculator answers a narrow question well: given what you spend and what you have, how far are you from a fund of three, six, nine or twelve months? It does not tell you which target is right for you, how long saving will take, what the money will earn or how inflation will change your expenses. It also assumes no income during an emergency and the same costs every month.

Use it to set a clear target, then plan the rest:

• The inflation impact calculator shows how fast rising prices make an old target too small.
• The deposit vs investment calculator shows what a deposit earns on the money you set aside.
• The compound interest calculator projects long-term savings once the fund is complete.
• The FIRE calculator takes the same monthly expenses and asks how much you would need to stop working.

Once the fund is in place, the article on what investing is is a good next step. For decisions that depend on your taxes, insurance, debts or a business, consider a qualified, independent financial adviser.